O-LevelBiologyEcology & Environment5090/12 · May/June 2023 · Q381 Mark

The diagram shows a simplified nitrogen cycle. [Figure 38.1] Which process in the cycle happens at stage X?

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Adecomposition

Bdenitrification

Cnitrogen fixation

Dnitrification

✓ Correct answer

C: nitrogen fixation

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Topic: Ecology & Environment, O-Level Biology (syllabus 5090). Multiple choice, 1 mark.
Source: O-Level Biology, May/June 2023 Paper 1 Variant 2, question 38.

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